I agree that it is their money and they can spend as they see fit. We have to take the time to educate them on the pros and cons of slabbing. I am against slabbing in any form regarding chips. If I wanted to incase them I would use Air Tites. I want to be able to pick mine up and hold them to look at.
Therefore I am content to be a slab free collector and a member of the slab free club.